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There are few taboos left in the world, but committing incest is one of them.

Having a sexual relationship with a close member of the family is against the law, but some people find themselves doing it anyway.

Several have shared their stories on Reddit threads, and they are all highly emotional.

One man reveals he’s been in a sexual relationship with his twin sister for a year.

The pair were 17 when it began and he doesn’t know why they were drawn to each other.

“I’ve been in a sexual relationship with my fraternal twin sister for around a year, we were 17 when we started and it really wasn’t a moment that then led to full on sex or anything like that the first sexual contact I would say we had was pretty much just a passionate hug.”

“Apart from a few things (which is nothing millions of other kids don’t go through) we had a pretty normal childhood, no deep rooted trauma or anything like that,” he wrote on Reddit.

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Another man spoke of being sexually attracted to his sister.

They were together for a year, but ended things after their family almost caught them.

Although he doesn’t feel any shame about what happened, he knows it’s impacted his life enormously.

“It’s been 11 years, and we haven’t talked about that time period since, but our relationship is as normal and as healthy as I think a brother and sister in their 20s can be,” he wrote.

“I don’t feel any real embarrassment or shame over what went on, but I do think that it shaped my sexuality greatly … I am highly attracted to a certain body type or hair color (that of my sister).”